Using a pulley system, a crew does 7,500 J of work to load a box that requires 4,500 J of work. What is the efficiency of the pulley system?

Answers

Answer 1

Answer:

3,000

Step-by-step explanation:


Related Questions

Find the circumference and the area of a circle with radius 3 m
Use the value 3.14 for π, and do not round your answers. Be sure to include the correct units in your answers.

Answers

Answer:

The area: 28.26m^2, the circumference: 18.85m

Step-by-step explanation:

The area of a circle is 3.14(3)^2, which is 28.26, the circumference is 2(3.14)(3)=18.85m.

Answer:

Area of a circle= π[tex]r^{2}[/tex]

3.14 x [tex]3^{2}[/tex] = 18.84

The area of the circle is 18.84 [tex]m^{2}[/tex]

Circumference of a circle = 2πr

2 x 3.14 x 3 = 18.84

The circumference of the circle is 18.84 m

They are both the same number but the area is squared.

Jess’s fish hook was 12 feet below the top of the water. He let out some of his line and the hook sunk another 3 feet. What is the depth of the fish hook now?


HELP ME PLEASE

Answers

The answer is 15

12 + 3 = 15

Answer: 15 feet

12 feet + 3 feet

12+3= 15 feet

Part D: Suppose Gabe walked from his house to
the library in 40 minutes. At this rate, how long
would it take him to walk from the library to the
gymnasium?

Answers

Answer:

50 minutes

Step-by-step explanation:

4 moves to the left = 40 minutes that means each block moved equals 10 minutes and library to gymnasium is 5 blocks

yall i need some help plz

Answers

Answer:

The shapes have been sorted by angles.

explanation:

In group A all the angles of the shapes are obtuse and acute angles, in group B there are at least 2 or more right angles in the shape.

Complete the statment with the best choice.

All rectangles are also_____________________.
a.
squares
c.
trapezoids
b.
parallelograms
d.
rhombuses


Please select the best answer from the choices provided

A
B
C
D

Answers

Answer:

B (are the letters of the choices supposed to be out of order?)

Step-by-step explanation:

All rectangles are also ______parallelograms______.

a.

squares

c.

trapezoids

b.

parallelograms

d.

rhombuses

Answer:

parallelograms

Step-by-step explanation:

- 4x < 8
pls help i will give brainly

Answers

Answer: x>-2
explanation: = -4x<8
= -4x/(-4)>8/(-4)
= x>-2

help me please please pl

Answers

Answer:

24 cubic inches

Step-by-step explanation:

The juice box is a rectangular prism

Volume of a rectangular prism = length x width x height

V = 3 x 2 x 4

V = 24 [tex]in^3[/tex]

4*3=12
12*2=24
Volume of the juice box is 24 inches cubed

proportional or not proportional?

Answers

Answer:

Proportional

Step-by-step explanation:

The relationship is proportional because starting at (0,0) there's a constant rate between the number of plants and the number of roses. We can represent this proportional relationship as y=5x where k=5, the constant of proportionality.

Proportional
Hope this helps<3

HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP

Answers

I think that the answer is B but I’m not sure… sorry if it’s wrong
The answer is B I think

Please help me this packet is due at 6 p.m please help me ill give brainlist

Answers

The correct answer is 600. For area do you Base times height which is 20×30 which equals 60.

Answer:

the answer is 600

Step-by-step explanation:

What is the area of this parallelogram?

Answers

Answer:

can you put a picture

Step-by-step explanation:

so I can answer this question

B, 20 cm. The formula for finding a parallelogram’s area is base • height. In this case, 4 cm is the base and 5 cm is the height, so all you have to do is 4 • 5.

Help me with this answer please

Answers

I’m not sure but if it’s LCM it’s 60 if it’s GCF it’s 1
LCM: 60
GCF: 1
(srry if im wrong)

pls help i will give brainliest to the correct answer!! :)

Answers

Answer:

15

Step-by-step explanation:

YOu take the biggest number in the box and subtract it from the smaller one if that makes sense. 18-3=15

the answer is 15 because the biggest box(18) minus the littlest box(3) is 15

7y+5z-2y+z

grade 7 math

Answers

Answer:

Step-by-step explanation:

7y+5z-2y+z

Group the two y and the two z together

7y-2y = 5y

5z+z= 6z

(a variable with out a number is = to 1)

so it would be  5y+6z

Hope this helps

The answer would be 5y+6z.
The reason for this is because only like terms can be added and subtracted.
(7y-2y) and (5z+z)

Matt and Ming are selling fruit for a school fundraiser. Customers can buy small boxes and large boxes of apples. Matt sold 5 small boxes of apples and 15 large boxes of apples for a total of $ 165 . Ming sold 11 small boxes of apples and 9 large boxes of apples for a total of $ 147 . Choose the system of equations that represent the situation.

Answers

Mind helping me on this? https://brainly.com/question/23506969 thanks!

PLEASE HELP I NEED AN ANSWER TO THE IMAGE!!

Answers

X = 11. You get the answer from knowing that the inside of the triangle adds up to 180, therefore u know the bottom left is 33 since it is “opposite” of the other 33, the bottom right is 2x, and the top is 180 - 5x.
33+180-5x+2x = 180
Solve and you will get x = 11

Which function below translate f(x)=x^2 left 5 units and down 1 unit?

A. f(x)=(x-1)^2-5
b. (f(x)=(x+5)^2+1
c. f(x)=(x-5)^2-1
d. f(x)=(x+5)^2-1

Answers

Your answer will b D
The correct answer is D

if u can’t see the pic don’t bother answering !!! pls hurryyyy

Answers

Answer:

First, you would find the area of the trapezoid (I assume), then you would find the area of the circle. Then subtract the area of the circle from the area of trapezoid. Use the following equation:

Area of trapezoid - Area of circle

Answer:

Step-by-step explanation:

im not 100% sure put i beleive its called sector

sry if im wrong

How would I find the range btw im only allowed a Ti-84 calculator So pls tell me how to solve this without using any stepbystep caulculators or desmos

Answers

Answer:

D

Step-by-step explanation:

u dont really need a calculator for this problem

to find the answer, you have to look at the equation.

f(x)=20x+4

the 4 is the y-intercept (0,4), which tells us that the range will start from number 4.

the 20x tells u to multiply the x by the 20

so if it was 20(1)=20, 20(2)= 40, 20(3)= 60 ....

so if you add x amount of plates to the barbell, it will be 20 times x plus 4(because 4lbs is the weight of the barbell itself)

so 0 plates is 4, 1 plate is 20(2) + 4 = 44, 20(4)+4= 84 ....

(i didnt do 20(1) or 20(3) because you need to have a even number of plates of each side of the barbell.)

pls help me lol
(2x2 - 5)(3x2 + 4)

a
6x^4 + 7x^2 - 20
b
6^x4 + 23x^2 - 20
c
6x^4 - 7x^2 - 20
d
6x^4 - 23x^2 - 20

Answers

Answer:

C.

[tex](2 {x}^{2} - 5)(3 {x}^{2} + 4) \\ = (6 {x}^{4} + 8 {x}^{2} - 15 {x}^{2} - 20) \\ = (6 {x}^{4} - 7 {x}^{2} - 20)[/tex]

Answer:

Answer is C!!!!!

Step-by-step explanation:

Helpppp

Five students came for after-school tutoring. Lin’s teacher assigned each of them the same number of problems to complete. Then he assigned each student 2 more problems. 30 problems were assigned in all.
Solve for x. SHOW ALL Work.

Answers

Answer

he assaighed 6 problems to each of them

Step-by-step explanation:

he assaighned 2 to each if the total is 30 that means 30 / 5 = 6 so x = 4 and the student had 6 problems

Answer:

6 problems

Step-by-step explanation:

30 problems  in all and there are five students so

30/5 is 6.

each one of them had 6 problems

they first  had 4 problems then after the two problems  it became 6

The systems shown have the same solution set.

Answers

Answer: true

Step-by-step explanation:

Sry if I’m wrong

The answer is true :) hope this helped

PLS HELP! ALSO INCLUDE AN EXPLAINATION LIKE I HAVE THE ANSWER I JUST DON'T KNOW HOW TO SOLVE IT.
-10 ≤ 2(2x + 7) ≤ 10.

Answers

Answer:

Step-by-step explanation: So first I changed 2(2x + 7) with the distributive property:

4x + 14

Since the above has to be less than or equal to 10, I know that x has to be negative.

If we make x = -1, 4x + 14 simplifies to -4 + 14, which simplifies to 10.

This satisfies the inequality, since it is greater than or equal to -10, and less than or equal to -10.

Hope this explained it well!

Answer:

-6 ≤ x ≤ -1.

Step-by-step explanation:

-10 ≤ 2(2x + 7) ≤ 10

Split it up into 2 inequalities:

2(2x + 7) ≥ -10    (reading from the middle to the left)

4x + 14  ≥ -10

4x  ≥ -24

x  ≥ -6.

and:

2(2x + 7) ≤ 10

4x + 14 ≤ 10

4x ≤ -4

x ≤ -1.

Combining the 2 we have:

-6 ≤ x ≤ -1.

Maria is making a gelatin dessert for a party. She plans on making 12 servings for every 6 people. If each pan Maria uses to make the dessert holds 8 servings, what is the minimum number of these pans will she needs in order to serve 112 people?

Please I really need help.

Answers

Very easy!
6 people= 12 servings so 1 person= 2 servings
We have 112 people so we need 112 x 2= 224 servings
So she will make 224 servings with an 8 servings pan, 224/8= 28 pans.
The minimum number of pans she need in order to serve 112 people is 28 pans!

ignore “c”. i need help with 5 and 6. i suck at this lol. brainliest for whoever gives best answer

Answers

Answer:

5 = 1/3

6 A = 24%

6 C = 26%

Step-by-step explanation:

sorry if its wrong i didn't have a lot of time

Please help me!! Will give Brainiest and stars if correct. Please help!

Each of the polygons that were put in the shape has a size (shown above). Use these measurements to find the area and perimeter of the complex polygon.

Answers

6 plus 6 is 12 then 12 plus 3 is 15 then 15 plus 3 and 3 is 21 then we do 21 plus 4.2 is 25.4 plus 3 is 28.4 hope this helps
the guy above me is correct

can someone help me in this problem please :C

Answers

2/3? please im not einstien

Answer:

1/6 cu feet

Step-by-step explanation:

2/3 x 1/4 = 1/6 x 1 = 1/6 cu feet

Can someone help me with this? No links please.

Answers

Answer: ≈415.42563

Step-by-step explanation: Explanation is below.

To avold a storm, a passenger-jet pilot descended 0.44mile in 0.8 minute. What was the plane's average change of altitude per minute?

Answers

Descends 0.55 miles per minute
Answer:
in order to find the answer you have to divide 0.44 by 0.8
when you divide decimals, the number that goes outside needs to be a whole number so it has to be 8
since you moved the decimal you also have to move the decimal from the inside. If you move the decimal it is going to be 4.4
so now you divide those numbers. 4.4/8

Hope this helps!
Step-by-step explanation:

Evaluate the expression: 25 over 33 divided by x

x = 3/4

Answers

Answer:

Exact form is 10 over 9

Decimal Form is 1.1

Mixed number is 1 whole and 1 over 9

Step-by-step explanation:

1.01010101 is the correct decimal answer
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